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Finding the Third Proportional to 4,916 and 6,390

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Solution

The third proportional to 4,916 and 6,390 is: 8,305.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,916 : 6,390 = 6,390 : x
  2. Step 2: Convert to fraction form
    4,916/6,390 = 6,390/x
  3. Step 3: Cross multiply
    4,916x = 6,390 × 6,390
  4. Step 4: Simplify right side
    4,916x = 40,832,100
  5. Step 5: Solve for x
    x = 40,832,100/4,916
  6. Step 6: Final answer
    x = 8,305.96

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.